While they don't use as many different kinds of BI tools and they don't pursue BI for quite as many reasons, small and mid-sized businesses are close behind larger companies in their use of BI.
Mid-market firms invest in business intelligence systems for three main reasons: to improve business processes, compile financial results and gather and analyze customer information. (Compliance and competitive intelligence aren't as high a priority.) They are more likely than larger companies to use open source BI tools. In addition, they are more satisfied with the quality of their BI data than larger companies, although it's still frequently a problem.
Source: CIO Insight, http://www.cioinsight.com